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Lawn care timing for San Bernardino, CA
Timed to the live soil near 92401 — about 78°F right now — not a national calendar.
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Winter-weed preventer, around September.
Plan for a warm-season lawn.Switch to cool-season →Which is mine?
Cool-season grass (fescue, Kentucky bluegrass) stays green through winter. Warm-season grass (Bermuda, Zoysia, St. Augustine) turns brown and goes dormant in winter.
Typical months shown · status is live for San Bernardino, CA.
Jan–MayCrabgrass preventerAll lawns
Put down a crabgrass preventer (a “pre-emergent”) before the seeds sprout, as soil nears 55°F.
Mar–JunSpring feedingWarm-season
Feed once your warm-season lawn has turned green and is actively growing (around 65°F soil).
Apr–JunAeration (loosen the soil)Warm-season
Pull small plugs of soil to relieve compaction during active growth, so your warm-season lawn bounces back fast.
May–JulGrub preventionAll lawns
Put down preventive grub control before eggs hatch, then water it in.
Jun–AugSummer feedingWarm-season
Keep your warm-season lawn fed through its peak summer growth.
Aug–NovWinter-weed preventerAll lawns
Stop poa annua (annual bluegrass) and other winter weeds before they sprout, as soil cools toward ~70°F — a fall “pre-emergent.”
Soil temperature data by Open-Meteo (CC BY 4.0), modeled ~2 in (6 cm) deep and updated daily. Informational guidance only — always follow product labels.
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Common questions for San Bernardino, CA
When should I apply crabgrass pre-emergent in San Bernardino, CA? +
Apply when the soil temperature near 92401 approaches 55°F and is still rising — typically a week or two before crabgrass germinates. LawnTide watches the soil for you and emails you the exact week.
What's the soil temperature in 92401 right now? +
The soil near San Bernardino, CA is about 78°F about 2 inches deep (6 cm) right now — modeled, updated daily.
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